/* Brand tokens from the North Gardendale design system (packages/design-system in the ngdale repo). */
:root {
  --navy-700: #0C1A3C;
  --navy-600: #142852;
  --navy-100: #D2D8E4;
  --navy-50: #EBEEF4;
  --teal-600: #17AAB4;
  --teal-700: #0F8A91;
  --teal-50: #E6F3F5;
  --lime-700: #6BA52E;
  --lime-100: #ECF7DD;
  --ink-900: #0A0E1A;
  --ink-500: #5A6378;
  --ink-200: #D6DAE2;
  --paper: #FFFFFF;
  --paper-200: #F2F8F9;
  --danger: #C23A24;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(12, 26, 60, 0.06), 0 4px 16px rgba(12, 26, 60, 0.06);
  --font: "Plus Jakarta Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper-200);
  color: var(--ink-900);
  font: 16px/1.5 var(--font);
}
a { color: var(--teal-700); }
h1, h2 { color: var(--navy-700); line-height: 1.2; margin: 0; }
h1 { font-size: 1.6rem; font-weight: 800; }
h2 { font-size: 1.2rem; font-weight: 700; }
.muted { color: var(--ink-500); }
.small { font-size: 0.85rem; }

/* Top bar */
.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 10px 16px; background: var(--paper); border-bottom: 1px solid var(--ink-200);
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--navy-700); text-decoration: none; }
.brand img { display: block; }
.brand strong { color: var(--teal-700); }
.topbar form { margin: 0; }
.topnav { display: flex; align-items: center; gap: 4px; }

.page { max-width: 1040px; margin: 0 auto; padding: 24px 16px 64px; }
.page-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 8px 0 16px; flex-wrap: wrap; }
.crumbs { font-size: 0.9rem; color: var(--ink-500); margin-bottom: 8px; }
.crumbs a { color: var(--ink-500); }

.flash {
  background: var(--lime-100); color: #33521A; border: 1px solid #CFE99A;
  padding: 10px 14px; border-radius: var(--radius); margin: 0 0 16px;
}
.error {
  background: #FBE9E5; color: var(--danger); border: 1px solid #F3C5BB;
  padding: 10px 14px; border-radius: var(--radius);
}

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-height: 40px; padding: 8px 16px; border-radius: 999px;
  border: 1px solid var(--ink-200); background: var(--paper); color: var(--navy-700);
  font: 600 0.95rem/1 var(--font); text-decoration: none; cursor: pointer;
}
.btn:hover { border-color: var(--navy-600); }
.btn:focus-visible, input:focus-visible { outline: 3px solid var(--teal-600); outline-offset: 2px; }
.btn--primary { background: var(--navy-700); border-color: var(--navy-700); color: #fff; }
.btn--primary:hover { background: var(--navy-600); }
.btn--danger { color: var(--danger); border-color: #F3C5BB; }
.btn--danger:hover { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn--ghost { background: transparent; border-color: transparent; }
.btn--small { min-height: 34px; padding: 6px 12px; font-size: 0.875rem; }
.btn--danger-text { color: var(--danger); border-color: transparent; background: transparent; }
.btn--danger-text:hover { border-color: #F3C5BB; }

/* Cards & forms */
.card { background: var(--paper); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.narrow { max-width: 520px; margin: 24px auto; }
.card h1 { margin-bottom: 8px; }
.form { display: grid; gap: 18px; margin-top: 16px; }
.form label { display: grid; gap: 6px; font-weight: 600; color: var(--navy-700); }
.form input[type="text"], .form input[type="url"], .form input[type="number"], .form input[type="password"] {
  width: 100%; min-height: 44px; padding: 10px 12px;
  border: 1px solid var(--ink-200); border-radius: 10px; font: 400 1rem var(--font); color: var(--ink-900);
}
.form input[type="file"] { font: 400 0.95rem var(--font); }
.form__actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* Thumbnails */
.thumb { width: 96px; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 8px; background: var(--navy-50); flex: none; }
.thumb--wide { width: 100%; }
.thumb--empty { display: grid; place-items: center; color: var(--ink-500); font-size: 0.75rem; }
img.thumb[hidden] { display: none; }

/* Grade list */
.grade-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.grade-row {
  display: flex; align-items: center; gap: 16px; padding: 12px;
  background: var(--paper); border-radius: var(--radius); box-shadow: var(--shadow);
  color: inherit; text-decoration: none;
}
.grade-row:hover { box-shadow: 0 0 0 2px var(--teal-600), var(--shadow); }
.grade-row__text { display: grid; flex: 1; }
.grade-row__text strong { color: var(--navy-700); font-size: 1.1rem; }
.grade-row__go { color: var(--teal-700); font-weight: 600; white-space: nowrap; }

/* Grade page */
.grade-head h1 { flex: 1; }
.grade-head .thumb { width: 120px; }
.actions { display: flex; gap: 8px; }
.actions form { margin: 0; }

/* Lesson grid */
.lesson-grid {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}
.lesson-card {
  display: flex; flex-direction: column; background: var(--paper);
  border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden;
}
.lesson-card .thumb { border-radius: 0; }
.lesson-card__body { display: grid; gap: 4px; padding: 12px 14px; flex: 1; }
.lesson-card__body strong { color: var(--navy-700); }
.lesson-card__actions { display: flex; justify-content: space-between; padding: 8px 10px; border-top: 1px solid var(--ink-200); }
.lesson-card__actions form { margin: 0; }

@media (max-width: 560px) {
  h1 { font-size: 1.35rem; }
  .brand span { font-size: 0.95rem; }
  .grade-row__go { display: none; }
  .grade-head .thumb { width: 88px; }
  .actions { width: 100%; }
}